Table 3.
Recommendations for the use of SAR properties and techniques in order to characterize wetlands typologies.
| SAR Properties and Techniques | Free Water | Herbaceous Wetland | Forested Wetland | Herbaceous vs. Forested Wetland | Water Level |
|---|---|---|---|---|---|
| SAR Properties | |||||
| Wavelength band | X | C | L or C + L | C + L | |
| Polarization | VV | HH | VV or HH | VH or HV or combination | HH, VH or HV |
| Incidence angle | |||||
| SAR Techniques | |||||
| Backscatter intensity | Thresholding, texture and segmentation | Multi-temporal approach | Multi-temporal and multi-incidence approach | Seasonal approach | |
| InSAR | Low temporal baselines | ||||
| Altimetry | Alone or combined with InSAR or backscatter | ||||
| Polarimetry | HH + HH/HV decomposition Freeman-Dourden and Claude Poitier decompositions | Alpha angle and multi-temporal approach | |||
| Recommended (Free Access Data) | |||||
| Sentinel 1 | Sentinel 1 | Sentinel 1, ALOS-PALSAR | Sentinel 1, ALOS-PALSAR | Sentinel 1, ALOS-PALSAR | |
Note: VV: vertical transmit and vertical receive polarization, HH: horizontal transmit and horizontal receive polarization, HV: horizontal transmit and vertical receive polarization and VH: vertical transmit and horizontal receive polarization.